US PATENT SUBCLASS 73 / 54.29
.~.~.~.~ Comparator

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

53.01  DF  LIQUID ANALYSIS OR ANALYSIS OF THE SUSPENSION OF SOLIDS IN A LIQUID {15}
54.01  DF  .~ Viscosity {11}
54.23  DF  .~.~ Force reactance to member driven therein {5}
54.28  DF  .~.~.~ Rotationally driven member {4}
54.29.~.~.~.~ Comparator

DEFINITION

Classification: 73/54.29

Comparator:

(under subclass 54.28) Subject matter wherein the determination is made by comparing measurements of a member rotating in a first liquid with the same or an identical member rotating in a second liquid.